Finding the Fourth Proportional to 2,650.80, 3,974.89 and 801.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,650.80 : 3,974.89 = 801.57 : x
2. Step 2: Convert to fraction form
   2,650.80/3,974.89 = 801.57/x
3. Step 3: Cross multiply
   2,650.80x = 3,974.89 × 801.57
4. Step 4: Simplify right side
   2,650.80x = 3,186,152.58
5. Step 5: Solve for x
   x = 3,186,152.58/2,650.80
6. Step 6: Final answer
   x = 1,201.96